Yeah, 30 years. There was a lot of background radiation from Cs-137 from all the... | Hacker News

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		neutronicus on March 13, 2011 \| parent \| context \| favorite \| on: Why I am not worried about Japan’s nuclear reactor... Yeah, 30 years. There was a lot of background radiation from Cs-137 from all the old nuclear testing that's disappearing now.

fxj on March 14, 2011 [–]

ummm half life means factor 2 in activity reduction. to obtain a factor 1000 in activity reduction you would have to wait 10 times as long. 300 years?

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